Abstract: A projection lens unit of the present disclosure is a projection lens unit that enlarges and projects image light output from an image forming unit onto a projection target, the image light including first light and second light having a longer wavelength band than the first light. The projection lens unit includes a plurality of lenses coated with a first antireflection coating, and a wavelength selection filter having a first region in a center of the wavelength selection filter through which an optical axis passes and a second region around the first region. In the wavelength selection filter, a transmittance of the first light in the second region is lower than a transmittance of the first light in the first region.

Abstract: A projection lens unit of the present disclosure is a projection lens unit that enlarges and projects image light output from an image forming unit onto a projection target, the image light including first light and second light having a longer wavelength band than the first light. The projection lens unit includes a plurality of lenses coated with a first antireflection coating, and a wavelength selection filter having a first region in a center of the wavelength selection filter through which an optical axis passes and a second region around the first region. In the wavelength selection filter, a transmittance of the first light in the second region is lower than a transmittance of the first light in the first region.

Abstract: A projection display apparatus for projecting and displaying image light onto a projection plane includes an image light generator that generates the image light, a projection optical system including a projection lens that projects the image light onto the projection plane, a focus controller that controls focusing of the projection lens, and a temperature sensor that detects a temperature of the projection display apparatus. The focus controller operates to, calculate a plurality of focus deviation amounts which correspond respectively to a plurality of component groups based on first information obtained from the image light generator and second information obtained from the temperature sensor, the plurality of component groups being classified depending on kinds of components constructing the projection optical system, calculate a focus correction amount according to the plurality of focus deviation amounts calculated, and control the focusing based on the focus correction amount calculated.

Abstract: A projection display apparatus for projecting and displaying image light onto a projection plane includes an image light generator that generates the image light, a projection optical system including a projection lens that projects the image light onto the projection plane, a focus controller that controls focusing of the projection lens, and a temperature sensor that detects a temperature of the projection display apparatus. The focus controller operates to, calculate a plurality of focus deviation amounts which correspond respectively to a plurality of component groups based on first information obtained from the image light generator and second information obtained from the temperature sensor, the plurality of component groups being classified depending on kinds of components constructing the projection optical system, calculate a focus correction amount according to the plurality of focus deviation amounts calculated, and control the focusing based on the focus correction amount calculated.